/
walk.ml
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walk.ml
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open Common;;
(*
* The purpose of this module is just to decouple the AST from the
* various passes that are interested in visiting "parts" of it.
* If the AST shifts, we have better odds of the shift only affecting
* this module rather than all of its clients. Similarly if the
* clients only need to visit part, they only have to define the
* part of the walk they're interested in, making it cheaper to define
* multiple passes.
*)
type visitor =
{
visit_stmt_pre: Ast.stmt -> unit;
visit_stmt_post: Ast.stmt -> unit;
visit_slot_identified_pre: (Ast.slot identified) -> unit;
visit_slot_identified_post: (Ast.slot identified) -> unit;
visit_expr_pre: Ast.expr -> unit;
visit_expr_post: Ast.expr -> unit;
visit_ty_pre: Ast.ty -> unit;
visit_ty_post: Ast.ty -> unit;
visit_constr_pre: node_id option -> Ast.constr -> unit;
visit_constr_post: node_id option -> Ast.constr -> unit;
visit_pat_pre: Ast.pat -> unit;
visit_pat_post: Ast.pat -> unit;
visit_block_pre: Ast.block -> unit;
visit_block_post: Ast.block -> unit;
visit_lit_pre: Ast.lit -> unit;
visit_lit_post: Ast.lit -> unit;
visit_lval_pre: Ast.lval -> unit;
visit_lval_post: Ast.lval -> unit;
visit_mod_item_pre:
(Ast.ident
-> ((Ast.ty_param identified) array)
-> Ast.mod_item
-> unit);
visit_mod_item_post:
(Ast.ident
-> ((Ast.ty_param identified) array)
-> Ast.mod_item
-> unit);
visit_obj_fn_pre:
(Ast.obj identified) -> Ast.ident -> (Ast.fn identified) -> unit;
visit_obj_fn_post:
(Ast.obj identified) -> Ast.ident -> (Ast.fn identified) -> unit;
visit_obj_drop_pre:
(Ast.obj identified) -> Ast.block -> unit;
visit_obj_drop_post:
(Ast.obj identified) -> Ast.block -> unit;
visit_crate_pre: Ast.crate -> unit;
visit_crate_post: Ast.crate -> unit;
}
;;
let empty_visitor =
{ visit_stmt_pre = (fun _ -> ());
visit_stmt_post = (fun _ -> ());
visit_slot_identified_pre = (fun _ -> ());
visit_slot_identified_post = (fun _ -> ());
visit_expr_pre = (fun _ -> ());
visit_expr_post = (fun _ -> ());
visit_ty_pre = (fun _ -> ());
visit_ty_post = (fun _ -> ());
visit_constr_pre = (fun _ _ -> ());
visit_constr_post = (fun _ _ -> ());
visit_pat_pre = (fun _ -> ());
visit_pat_post = (fun _ -> ());
visit_block_pre = (fun _ -> ());
visit_block_post = (fun _ -> ());
visit_lit_pre = (fun _ -> ());
visit_lit_post = (fun _ -> ());
visit_lval_pre = (fun _ -> ());
visit_lval_post = (fun _ -> ());
visit_mod_item_pre = (fun _ _ _ -> ());
visit_mod_item_post = (fun _ _ _ -> ());
visit_obj_fn_pre = (fun _ _ _ -> ());
visit_obj_fn_post = (fun _ _ _ -> ());
visit_obj_drop_pre = (fun _ _ -> ());
visit_obj_drop_post = (fun _ _ -> ());
visit_crate_pre = (fun _ -> ());
visit_crate_post = (fun _ -> ()); }
;;
let path_managing_visitor
(path:Ast.name_component Stack.t)
(inner:visitor)
: visitor =
let visit_mod_item_pre ident params item =
Stack.push (Ast.COMP_ident ident) path;
inner.visit_mod_item_pre ident params item
in
let visit_mod_item_post ident params item =
inner.visit_mod_item_post ident params item;
ignore (Stack.pop path)
in
let visit_obj_fn_pre obj ident fn =
Stack.push (Ast.COMP_ident ident) path;
inner.visit_obj_fn_pre obj ident fn
in
let visit_obj_fn_post obj ident fn =
inner.visit_obj_fn_post obj ident fn;
ignore (Stack.pop path)
in
let visit_obj_drop_pre obj b =
Stack.push (Ast.COMP_ident "drop") path;
inner.visit_obj_drop_pre obj b
in
let visit_obj_drop_post obj b =
inner.visit_obj_drop_post obj b;
ignore (Stack.pop path)
in
{ inner with
visit_mod_item_pre = visit_mod_item_pre;
visit_mod_item_post = visit_mod_item_post;
visit_obj_fn_pre = visit_obj_fn_pre;
visit_obj_fn_post = visit_obj_fn_post;
visit_obj_drop_pre = visit_obj_drop_pre;
visit_obj_drop_post = visit_obj_drop_post;
}
;;
let walk_bracketed
(pre:'a -> unit)
(children:unit -> unit)
(post:'a -> unit)
(x:'a)
: unit =
begin
pre x;
children ();
post x
end
;;
let walk_option
(walker:'a -> unit)
(opt:'a option)
: unit =
match opt with
None -> ()
| Some v -> walker v
;;
let rec walk_crate
(v:visitor)
(crate:Ast.crate)
: unit =
walk_bracketed
v.visit_crate_pre
(fun _ -> walk_mod_items v (snd crate.node.Ast.crate_items))
v.visit_crate_post
crate
and walk_mod_items
(v:visitor)
(items:Ast.mod_items)
: unit =
Hashtbl.iter (walk_mod_item v) items
and walk_mod_item
(v:visitor)
(name:Ast.ident)
(item:Ast.mod_item)
: unit =
let children _ =
match item.node.Ast.decl_item with
Ast.MOD_ITEM_type (_, ty) -> walk_ty v ty
| Ast.MOD_ITEM_fn f -> walk_fn v f item.id
| Ast.MOD_ITEM_tag (htup, ttag, _) ->
walk_header_tup v htup;
walk_ty_tag v ttag
| Ast.MOD_ITEM_mod (_, items) ->
walk_mod_items v items
| Ast.MOD_ITEM_obj ob ->
walk_header_slots v ob.Ast.obj_state;
walk_constrs v (Some item.id) ob.Ast.obj_constrs;
let oid = { node = ob; id = item.id } in
Hashtbl.iter (walk_obj_fn v oid) ob.Ast.obj_fns;
match ob.Ast.obj_drop with
None -> ()
| Some d ->
v.visit_obj_drop_pre oid d;
walk_block v d;
v.visit_obj_drop_post oid d
in
walk_bracketed
(v.visit_mod_item_pre name item.node.Ast.decl_params)
children
(v.visit_mod_item_post name item.node.Ast.decl_params)
item
and walk_ty_tup v ttup = Array.iter (walk_ty v) ttup
and walk_ty_tag v ttag = Hashtbl.iter (fun _ t -> walk_ty_tup v t) ttag
and walk_ty
(v:visitor)
(ty:Ast.ty)
: unit =
let children _ =
match ty with
Ast.TY_tup ttup -> walk_ty_tup v ttup
| Ast.TY_vec s -> walk_ty v s
| Ast.TY_rec trec -> Array.iter (fun (_, s) -> walk_ty v s) trec
| Ast.TY_tag ttag -> walk_ty_tag v ttag
| Ast.TY_iso tiso -> Array.iter (walk_ty_tag v) tiso.Ast.iso_group
| Ast.TY_fn tfn -> walk_ty_fn v tfn
| Ast.TY_obj (_, fns) ->
Hashtbl.iter (fun _ tfn -> walk_ty_fn v tfn) fns
| Ast.TY_chan t -> walk_ty v t
| Ast.TY_port t -> walk_ty v t
| Ast.TY_constrained (t,cs) ->
begin
walk_ty v t;
walk_constrs v None cs
end
| Ast.TY_named _ -> ()
| Ast.TY_param _ -> ()
| Ast.TY_native _ -> ()
| Ast.TY_idx _ -> ()
| Ast.TY_mach _ -> ()
| Ast.TY_type -> ()
| Ast.TY_str -> ()
| Ast.TY_char -> ()
| Ast.TY_int -> ()
| Ast.TY_uint -> ()
| Ast.TY_bool -> ()
| Ast.TY_nil -> ()
| Ast.TY_task -> ()
| Ast.TY_any -> ()
| Ast.TY_box m -> walk_ty v m
| Ast.TY_mutable m -> walk_ty v m
in
walk_bracketed
v.visit_ty_pre
children
v.visit_ty_post
ty
and walk_ty_sig
(v:visitor)
(s:Ast.ty_sig)
: unit =
begin
Array.iter (walk_slot v) s.Ast.sig_input_slots;
walk_constrs v None s.Ast.sig_input_constrs;
walk_slot v s.Ast.sig_output_slot;
end
and walk_ty_fn
(v:visitor)
(tfn:Ast.ty_fn)
: unit =
let (tsig, _) = tfn in
walk_ty_sig v tsig
and walk_constrs
(v:visitor)
(formal_base:node_id option)
(cs:Ast.constrs)
: unit =
Array.iter (walk_constr v formal_base) cs
and walk_check_calls
(v:visitor)
(calls:Ast.check_calls)
: unit =
Array.iter
begin
fun (f, args) ->
walk_lval v f;
Array.iter (walk_atom v) args
end
calls
and walk_constr
(v:visitor)
(formal_base:node_id option)
(c:Ast.constr)
: unit =
walk_bracketed
(v.visit_constr_pre formal_base)
(fun _ -> ())
(v.visit_constr_post formal_base)
c
and walk_header_slots
(v:visitor)
(hslots:Ast.header_slots)
: unit =
Array.iter (fun (s,_) -> walk_slot_identified v s) hslots
and walk_header_tup
(v:visitor)
(htup:Ast.header_tup)
: unit =
Array.iter (walk_slot_identified v) htup
and walk_obj_fn
(v:visitor)
(obj:Ast.obj identified)
(ident:Ast.ident)
(f:Ast.fn identified)
: unit =
v.visit_obj_fn_pre obj ident f;
walk_fn v f.node f.id;
v.visit_obj_fn_post obj ident f
and walk_fn
(v:visitor)
(f:Ast.fn)
(id:node_id)
: unit =
walk_header_slots v f.Ast.fn_input_slots;
walk_constrs v (Some id) f.Ast.fn_input_constrs;
walk_slot_identified v f.Ast.fn_output_slot;
walk_block v f.Ast.fn_body
and walk_slot_identified
(v:visitor)
(s:Ast.slot identified)
: unit =
walk_bracketed
v.visit_slot_identified_pre
(fun _ -> walk_slot v s.node)
v.visit_slot_identified_post
s
and walk_slot
(v:visitor)
(s:Ast.slot)
: unit =
walk_option (walk_ty v) s.Ast.slot_ty
and walk_stmt
(v:visitor)
(s:Ast.stmt)
: unit =
let walk_stmt_for
(s:Ast.stmt_for)
: unit =
let (si,_) = s.Ast.for_slot in
let lv = s.Ast.for_seq in
walk_slot_identified v si;
walk_lval v lv;
walk_block v s.Ast.for_body
in
let walk_stmt_for_each
(s:Ast.stmt_for_each)
: unit =
let (si,_) = s.Ast.for_each_slot in
let (f,az) = s.Ast.for_each_call in
walk_slot_identified v si;
walk_lval v f;
Array.iter (walk_atom v) az;
walk_block v s.Ast.for_each_head
in
let walk_stmt_while
(s:Ast.stmt_while)
: unit =
let (ss,e) = s.Ast.while_lval in
Array.iter (walk_stmt v) ss;
walk_expr v e;
walk_block v s.Ast.while_body
in
let children _ =
match s.node with
Ast.STMT_log a ->
walk_atom v a
| Ast.STMT_new_rec (lv, atab, base) ->
walk_lval v lv;
Array.iter (fun (_, _, a) -> walk_atom v a) atab;
walk_option (walk_lval v) base;
| Ast.STMT_new_vec (lv, _, atoms) ->
walk_lval v lv;
Array.iter (walk_atom v) atoms
| Ast.STMT_new_tup (lv, mut_atoms) ->
walk_lval v lv;
Array.iter (fun (_, atom) -> walk_atom v atom) mut_atoms
| Ast.STMT_new_str (lv, _) ->
walk_lval v lv
| Ast.STMT_new_port lv ->
walk_lval v lv
| Ast.STMT_new_chan (chan,port) ->
walk_option (walk_lval v) port;
walk_lval v chan;
| Ast.STMT_new_box (dst, _, src) ->
walk_lval v dst;
walk_atom v src
| Ast.STMT_for f ->
walk_stmt_for f
| Ast.STMT_for_each f ->
walk_stmt_for_each f
| Ast.STMT_while w ->
walk_stmt_while w
| Ast.STMT_do_while w ->
walk_stmt_while w
| Ast.STMT_if i ->
begin
walk_expr v i.Ast.if_test;
walk_block v i.Ast.if_then;
walk_option (walk_block v) i.Ast.if_else
end
| Ast.STMT_block b ->
walk_block v b
| Ast.STMT_copy (lv,e) ->
walk_lval v lv;
walk_expr v e
| Ast.STMT_copy_binop (lv,_,a) ->
walk_lval v lv;
walk_atom v a
| Ast.STMT_call (dst,f,az) ->
walk_lval v dst;
walk_lval v f;
Array.iter (walk_atom v) az
| Ast.STMT_bind (dst, f, az) ->
walk_lval v dst;
walk_lval v f;
Array.iter (walk_opt_atom v) az
| Ast.STMT_spawn (dst,_,_,p,az) ->
walk_lval v dst;
walk_lval v p;
Array.iter (walk_atom v) az
| Ast.STMT_ret ao ->
walk_option (walk_atom v) ao
| Ast.STMT_put at ->
walk_option (walk_atom v) at
| Ast.STMT_put_each (lv, ats) ->
walk_lval v lv;
Array.iter (walk_atom v) ats
(* FIXME (issue #86): this should have a param array, and invoke the
* visitors.
*)
| Ast.STMT_decl (Ast.DECL_mod_item (id, mi)) ->
walk_mod_item v id mi
| Ast.STMT_decl (Ast.DECL_slot (_, slot)) ->
walk_slot_identified v slot
| Ast.STMT_yield
| Ast.STMT_fail ->
()
| Ast.STMT_join task ->
walk_lval v task
| Ast.STMT_send (dst,src) ->
walk_lval v dst;
walk_lval v src
| Ast.STMT_recv (dst,src) ->
walk_lval v dst;
walk_lval v src
| Ast.STMT_be (lv, ats) ->
walk_lval v lv;
Array.iter (walk_atom v) ats
| Ast.STMT_check_expr e ->
walk_expr v e
| Ast.STMT_check (cs, calls) ->
walk_constrs v None cs;
walk_check_calls v calls
| Ast.STMT_check_if (cs,calls,b) ->
walk_constrs v None cs;
walk_check_calls v calls;
walk_block v b
| Ast.STMT_prove cs ->
walk_constrs v None cs
| Ast.STMT_alt_tag
{ Ast.alt_tag_lval = lval; Ast.alt_tag_arms = arms } ->
walk_lval v lval;
let walk_arm { node = (pat, block) } =
walk_pat v pat;
walk_block v block
in
Array.iter walk_arm arms
(* FIXME (issue #20): finish this as needed. *)
| Ast.STMT_slice _
| Ast.STMT_note _
| Ast.STMT_alt_type _
| Ast.STMT_alt_port _ ->
unimpl (Some s.id) "statement type in Walk.walk_stmt"
in
walk_bracketed
v.visit_stmt_pre
children
v.visit_stmt_post
s
and walk_expr
(v:visitor)
(e:Ast.expr)
: unit =
let children _ =
match e with
Ast.EXPR_binary (_,aa,ab) ->
walk_atom v aa;
walk_atom v ab
| Ast.EXPR_unary (_,a) ->
walk_atom v a
| Ast.EXPR_atom a ->
walk_atom v a
in
walk_bracketed
v.visit_expr_pre
children
v.visit_expr_post
e
and walk_atom
(v:visitor)
(a:Ast.atom)
: unit =
match a with
Ast.ATOM_literal ls -> walk_lit v ls.node
| Ast.ATOM_lval lv -> walk_lval v lv
and walk_opt_atom
(v:visitor)
(ao:Ast.atom option)
: unit =
match ao with
None -> ()
| Some a -> walk_atom v a
and walk_lit
(v:visitor)
(li:Ast.lit)
: unit =
walk_bracketed
v.visit_lit_pre
(fun _ -> ())
v.visit_lit_post
li
and walk_lval
(v:visitor)
(lv:Ast.lval)
: unit =
walk_bracketed
v.visit_lval_pre
(fun _ -> ())
v.visit_lval_post
lv
and walk_pat
(v:visitor)
(p:Ast.pat)
: unit =
let walk p =
match p with
Ast.PAT_lit lit -> walk_lit v lit
| Ast.PAT_tag (lv, pats) ->
walk_lval v lv;
Array.iter (walk_pat v) pats
| Ast.PAT_slot (si, _) -> walk_slot_identified v si
| Ast.PAT_wild -> ()
in
walk_bracketed
v.visit_pat_pre
(fun _ -> walk p)
v.visit_pat_post
p
and walk_block
(v:visitor)
(b:Ast.block)
: unit =
walk_bracketed
v.visit_block_pre
(fun _ -> (Array.iter (walk_stmt v) b.node))
v.visit_block_post
b
;;
(*
* Local Variables:
* fill-column: 78;
* indent-tabs-mode: nil
* buffer-file-coding-system: utf-8-unix
* compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
* End:
*)